EAS build config + Collaboration UI + i18n updates

- eas.json for Android APK/AAB + iOS builds
- Collaboration page: assign, transfer, claim, subtasks
- Task detail: assignee avatars, subtask progress
- Updated translations (cs,he,ru,ua)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/src/routes/auth.js

@@ -114,6 +114,17 @@ async function authRoutes(app) {
         return { status: 'not_implemented', provider, message: `${provider} OAuth coming soon. Configure at Settings > Connections.` };
     });
 
+    // Search users by name or email (for collaboration)
+    app.get('/auth/users/search', async (req) => {
+        const q = (req.query.q || '').trim();
+        if (q.length < 2) return { data: [] };
+        const { rows } = await app.db.query(
+            "SELECT id, name, email, avatar_url FROM users WHERE (name ILIKE $1 OR email ILIKE $1) ORDER BY name LIMIT 20",
+            ["%" + q + "%"]
+        );
+        return { data: rows };
+    });
+
 }
 
 module.exports = authRoutes;